light_time
1. [ noun ] distance measured in terms of the speed of light (or radio waves)
Examples:

"the light time from Jupiter to the sun is approximately 43 minutes"

Related terms: distance
Similar spelling:   light_meter
  light_unit
  lighting
  lighten
  light-minded
  lightning
  Lightner
  light_minute
  lightness
  lightening
  lighten_up